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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9790f971ab54a491256e6316b924bf394e7f8c79a2b432e3777c05fe6bce1ffd' 
  AND token = 'OumPAbS8YR7LyKdD5gQ+g2lasyfHDcGEyi+5nPP19Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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