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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '022c89cf2e59ee2a373f3a2b1b3c9da58b36df8798e2746631b676119d966946' 
  AND token = 'z/KQTJmCU83oVOSp4hnEqHy9COmG1dW3LSPHxGcHf/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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