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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0818cbe292ce0e6d50d8f29886247a808aa44d3da66c2ae42e55e27d4b76f612' 
  AND token = '+tzPK3VgEqCWalfSjUQGKXIL2Z9fJwwtW0F8G6llKdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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