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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ad9b7253f2e4bd7e851cdaf46b918939da7401f1b16579dc6e0c14e44a44a0' 
  AND token = 'NvJGXAiGoXC/HnwhgozqsO4gnygro+kulbDUkga3qEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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