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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee28244304b5e5d4b45a62725270591811c829a3fb2ffc5a0058e1f784bd6bdd' 
  AND token = 'Joz/WJt/zwhUO5xI5te9BIeXTIaguPPGvd+NZzcWip4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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