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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f785a50efad12fd31f87d9268b8f126b304b509316c3cfdee500a045e68c4f' 
  AND token = 'SBhIh5v2ZQTmkapH+vTfrX78GBm9F98nm8GVVycuuNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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