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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f2823a0b9bf3c8dea31a5f93189dbf0f862b30aacb8efbe597954d2c55274b' 
  AND token = 'oHAkLrkpwOU+VhY50LL1Eg8/5kvvCVVb8HFfluIZLMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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