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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e7f9b1bb50aadb20eebab3a883dd9a14db3f040ff896213f5282954dd918f7' 
  AND token = '+GcD1Cgzgr7heca5dwnJGH38CaFBVEyknHV+agIo8AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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