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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe224275e06429509508770c94e5a8aa3626443fcfa373fc477e4a106acafdb' 
  AND token = 'Pg+fr+CLQ668aM5HMDIKKHCHGIg0nMqOrF+1jKJ9WFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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