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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7aa1ff75589527ee9d1ac915a3ca05a57e612994d5fabf89a17ea5998809543' 
  AND token = '2mn2I0VNiCUbpCtxXSDf7NYVq1DwGAd1Kb6CkOnlVlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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