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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13a35023ee89f2250a1c05fe3ac4c958e399b5a4a80a650fa181e474229e174' 
  AND token = 'u5nNWHiC9x/yV6a3Degifnob7xV2qRX8BO1G7gsGrPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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