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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c0cc4dcbb0228a66e2943c184d805adc092eed58309686cc2d6e061ca026d2' 
  AND token = 'ZxOfjHSrG2/EJLyYPoU5qPDyyI9adUaN4D/AuMP0hB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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