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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39deef855aee4873dfd4d45adbbd3397d19392f20ae16c7c7f6bd6a1a5156f8e' 
  AND token = 'o7QsL+MaUhB9iyy/UihC5uh+/9F4TPcG+JLjnOKChSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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