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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d3d69372f2da708e06dda7dbec101dc94f073d629498f6b3b35fa93be64a5fc' 
  AND token = 'oLkYn11ffnJwF82hE1Vve3LMGdPoAknmcTl1wlGi8ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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