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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4c32a16d6b7c04170be3c3ea20f7ec6d41faff25b411d77c734670ef1d137d' 
  AND token = 'giMIzDNWdyxGRJm0F57VpbgPOBTSZTfjBJ0WSDuMEoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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