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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '277bbae1026f2e94a14a6c1ba17d74a0d3b17f2f56bb84d4241a16abcfaeb55e' 
  AND token = 'jn2qRwGNrXLu9TeSZWlutV1ejAge86lurhpktrs22j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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