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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18b2a059613a1923364fcae6fdddb5119b208a3475e7a51508ee4660b6db2488' 
  AND token = '/57H5xt/TtwlLeT8Q0R3uwN9gzjklP5qi2zrsGIRyEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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