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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8cbeb07ab3a7bb6d2c4857a45ede38cc1d97d87dc131a2c117f2542830334b' 
  AND token = '1pU3fc0Kb4T3Ad+AdskL2ZIBzFhTv/sum3kRErUwPik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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