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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602a3eaabfb4c405b5e000d3f251af182627413f47c042d233a530be97fa34ca' 
  AND token = 'dvjxIi4kAhkyk2CCMPQiQc5u++oPWedF+BE0+Sq5bdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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