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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f16926cbd272b7192980d8d97c6bafbf60537adcec0e4dd630ec7f6fcef202' 
  AND token = 'p8k7ON3DyaUPP1qR4owAg2xrTm6S5wuvGpGd1E7ob7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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