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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b37aef0f4e77c828a151e14eb517c1d4937d6ab2895d3b52a80fdd0a48fb4bf' 
  AND token = 'ZkAv6Aff/6MD/9ToUE/HBSiy/aJ6unLU2d1uOt266hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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