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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beebdcb9a40511d2452a3eddc86713afd88dbc644f5d14048188dceafe147cbe' 
  AND token = 'Sw9/NnRYhC2Ih/Zg4V3p0RVAcipDBOGstR9L5Rw6L5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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