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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e531a97955e13cc07f9efc1c01fd9df5cd240dbd3916777b931ff1622e586f8e' 
  AND token = 'JUoiijugKjqQD8/8ktqbJgmGZclNK45I0bqAeRN5Tl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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