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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64c98b55cd246f9010f359d8f75073d01d5924f9387c1f72d9fd8e4e04e2690' 
  AND token = '7QoEb7HNES2Jrkw3G93R0LFIr1JvQnPo6dO90dX615o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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