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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90bb482352af8cb1c9f799336eade0366d72673867f566389958bca95f8b47e' 
  AND token = 'xy0JkNFfsM0WregEZyuPqHxvmW0JIcNd5qtEyM/Sm+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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