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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aff19a6ffd80663b79c43e25ebd3633be66b0ed72fda51acc9f5367ae48355f' 
  AND token = 'X1u8RoTR8fjGl8uV9iUhD/ofejnqKW13e5u4Kj0Qq24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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