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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc6bd61bd0b5d83ffab07e41d796387bb532adc4671e114b13091bfc00e153b' 
  AND token = 's8TygCKKrLyyS8tpfIupB6+ybej/VmykmLHGCX88lbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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