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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b06de13898f339a263a0ba90e36d797f40783e0261d28580b5cfb68af355d1f' 
  AND token = '1hcFVjxDGZ+M95znFeHf0/3e7Ocij1TRYXHVrSu9grs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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