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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f31c1799ae720bc73560bbc9aef36bbe2e62ff361824f52e6f335a8b2512a80' 
  AND token = 'eCx+g0yTR5VtV/QV1I8d1oin5yU9LwLAuq654QHnMMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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