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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc3b5e290dde62887c0d9745447e16993498d52873a662e4a98b4fed51869f1' 
  AND token = 'F6A537CQ41ptDVWgjMCq+t0l3sTBAeeb2cgcmQHPOaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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