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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea18b5977ff0ab8ef90c1153a6506f03d28657a34e7a1a2dadcae95b45af2c2' 
  AND token = 'OQ78oKimwV/JYy3I0Tu795Khn6cuwM1rTyE0t2zF9s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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