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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237fc75017f6cbaae8c05ee743bb57ca7db7ef4631f95ee8be5d07576e756262' 
  AND token = 'hKzEKth3vLK9Sh8sInzgTJ0vc0/sM2pL8Vcq3HgsH6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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