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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947ec5c9e14dfb65be3152c629237b3ca9725ffa86dc2c41fc3d634bd1586cdf' 
  AND token = '1zSxzAP3qqmWgnznO33kRz1vZ4NRvS6ty6WayxAou4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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