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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebff19f5807db6bc8d913f461ab9658aae09f16cbee9cc08f63baa222c694723' 
  AND token = 'Tbf/dogKfweLwiG8O9GTcVQPmZZWl+ntkPOMud66dfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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