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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01ef74baa1263ac09be951c601fcbdad44741dee595d4be7da7491bdd7134590' 
  AND token = 'kh4/ZSDW/vC+P6OXDjxNJCjQsSpSg5wMfGxIhJohUOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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