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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72be2fa17e0b631c4c954f9fabfbc5c1c2167f0e626f93ccc9ab2f085eaacb0' 
  AND token = '6pZHzq1PyUfsERoiZW61Xd3Huiys93sc3L9GDH9JCQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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