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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd0174a7994425306b2820434c8878fba3f71b80c5dd231eecedb6177107a3d' 
  AND token = 'yLbde0Ek+vRgug06p43mhpu5RgkDxPKftc+kB2PWXvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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