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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036c576f2eea47ddc2e633e2de38c2b64d5a5da4fa86338162cba8c2e9e88a4b' 
  AND token = 'Z/ThhdSTzKV03XVlXueyH095epKBCP4XMoVUNlbalBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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