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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c878abcae1006e293d5f2e5849606dfad4bbec04caf066fce2460b12f24807' 
  AND token = '/NxLZAdhDrcMkQaJcTbnGaft+7NyFNUT6+S2n+cKbuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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