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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee880db44f1e46c13d8af8237028bfb7826d891c83d023ce9ec58b8e5ec67ea' 
  AND token = 'I5BEyHYFzIWVm8oisCxSxqcMO4HroMDKQVAySE1HeLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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