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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e29767e87b329afad5c58bf9dd77145b5bc6e9d4224f2b9c1fca54b2b81e3c' 
  AND token = 'U38E7spOH4+bCIoIPO64ApFIdvbu0jU3oUA0veoz6ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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