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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089f39c6a001ec0814c3fd61e17e23014e872468ca99f463159e3cd9ac06f25b' 
  AND token = 'nvW6cPT4KJSpLiJHF8evi0px0xLjbFYb648MQRp1bo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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