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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b61d8feec6423b614622006a763fbda8565d9886e46116480b31a5c6478293' 
  AND token = '5lF6WSNh33NG2HoC2UX25UcyD48OSRH4OU4F7PHntuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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