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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f14f0aa4a4275b09583cdbf81290c72e08b6698ad028821c22bc37b33cfa69' 
  AND token = '605DiqALFG/ft3uO81BA51GAxeJ2iyc/lRAcTQn1AvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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