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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41c075ab00344c556f8776998b05f76dc0919dca0cc3b078c77aec278a9a1879' 
  AND token = 'g12YS4suWuUkiHGrzmV1bSa3j+rzvFheTtE9zSSrOLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}