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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb60c9034b79d3b1aca7ac9ec058c5ccd7c888ec76a3f41363336b88e26c17e' 
  AND token = 'yzXTv6CaBc8KfZpah6P/GXbOQYp2MhYFu+6+L3PP2lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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