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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5113820a31720f283a823c17f391b83c964b42be5191c9a5e23968c322e83a' 
  AND token = 'ZwCUsGrARwO4ale3p0DC2xodg+xCVyXalQPj37ME6uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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