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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2883e8536b95f7b4396662c20f9e49e737bfa3047f0bf81d5e03dce5b4d116f9' 
  AND token = 'tqZpwTEfp2w23gBvs3i9pcW4C/ct/QNLx+OMskgT/Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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