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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2f87ef4ac6d72a1b21916dddd7a70ff47425722cda27a53d5d8eb7f18e8ef7' 
  AND token = '5ydcThrxAhtrkDluVFtVDcWvNIic1BPbNI/K5fA+vg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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