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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171595e3a8e629878919454ecf73800a622c1fac8c9f3cf6941c478d49bb59bc' 
  AND token = 'Emp8B+RmVcQujJXyYAbr7oeHFpVSuENtYKBDsp7cADw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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