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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '891a1b039abd82c6df70418b2e59af6089244ecacd48a8da8894597c7288b5df' 
  AND token = 'AeNaGblL7UEpodEubNLBmN1/+d1sh03bNiSrQP3Q3Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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