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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b96596419ad1d854c02284391346518c8029fc863c5ab2d103fb4ba2c18329' 
  AND token = 'kNwRk8fxDF2Ulgvem4zyHzoR2DGuOUYRKaFgx4us19k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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