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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620de168d4b1896483542eb3c64cb726531cf18bf7133c733e83cee0a8723bd4' 
  AND token = '8E2+IbMjofUgSltnb9+vGIB0hErvy1i78r3R6UyO3GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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