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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2023b40d29940b1cf70670d46c5d9bb11d4544268c156ea87373828cbe8d2e' 
  AND token = 'YyGcapIsfn+M5u69RdOHODu1Jp618Pt+moFqzNjwVRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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